Securing SIP Traffic using TLSEncryption ensures that the call media and associated signaling remains private during transmission. Transport Layer Security (TLS) provides encryption for SIP signaling. When receiving SIP from CallTrackingMetrics, only a single crypto suite will be advertised: AES_CM_128_HMAC_SHA1_80

IP Address Whitelist

Prepare your communications infrastructure to make sure that your SIP infrastructure has connectivity toCallTrackingMetrics and vice versa. To ensure that your communications infrastructure doesn’t block communication, you must update your whitelist. We strongly encourage you to whitelist all of the following IP address ranges and ports on your firewall for SIP signaling and RTP media traffic.

This is important if you have numbers in different regions as well as for availability purposes (for example, if North America Virginia gateways are down, then North America Oregon gateways will be used).